Time reversal violation for entangled neutral mesons

3rd Symposium on Prospects in the Physics of Discrete Symmetries

Bernabéu, J.^1

Department of Theoretical Physics, University of Valencia, Joint Centre University Valencia-CSIC, Spain^1

关键词: BABAR experiment;    Direct observations;    Einstein-podolsky-rosen entanglements;    Large deviations;    Standard deviation;    Statistical significance;    Time evolutions;    Transfer of information;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/447/1/012005/pdf
DOI  :  10.1088/1742-6596/447/1/012005

来源: IOP

【 摘 要 】

A direct evidence for Time Reversal Violation (TRV) means an experiment that, considered by itself, clearly shows TRV independent of, and unconnected to, the results for CP Violation. No existing result before the recent BABAR experiment with entangled neutral B mesons had demonstrated TRV in this sense. There is a unique opportunity for a search of TRV with unstable particles thanks to the Einstein-Podolsky-Rosen (EPR) Entanglement between the two neutral mesons in B, and PHI, Factories. The two quantum effects of the first decay as a filtering measurement and the transfer of information to the still living partner allow performing a genuine TRV asymmetry with the exchange of "in" and "out" states. With four independent TRV asymmetries, BABAR observes a large deviation of T-invariance with a statistical significance of 14 standard deviations, far more than needed to declare the result as a discovery. This is the first direct observation of TRV in the time evolution of any system.